call antlr4  -o ../../src/main/java/com/xue/antlr/mysql -no-listener -visitor -package com.xue.antlr.mysql MySQLLexer.g4
call antlr4  -o ../../src/main/java/com/xue/antlr/mysql -no-listener -visitor -package com.xue.antlr.mysql MySQLParser.g4